Magnetite nanoparticles decorated on cellulose aerogel for -nitrophenol Fenton degradation: Effects of the active phase loading, cross-linker agent and preparation method.

Magnetite nanoparticles (FeO NPs) are among the most effective Fenton-Like heterogeneous catalysts for degrading environmental contaminants. However, FeO NPs aggregate easily and have poor dispersion stability because of their magnetic properties, which seriously decrease their catalytic efficiency. In this study, a novel environmentally friendly method for synthesising FeO@CA was proposed.

Self-build packed-bed bioreactor for rapid and effective BOD estimation.

This work demonstrated a simple, low-cost, rapid, and effective biochemical oxygen demand (BOD) estimation system based on a packed-bed bioreactor that can be easily self-built on-site at a particular wastewater treatment plant for continuous monitoring of the influent and effluent. The use of natural microbial consortium that were collected from the target wastewater and immobilized on a cheap porous carrier simply by adhesion resulted in an acceptable accuracy of over 95%. The newly developed semi-continuous operating mode with peak-type signals was shown to be able to continuously estimate BOD at a high flow rate to overcome the flow dependence of the oxygen electrode, limit clogging issues, enhance the response time, and lower the limit of detection.